Crossword Genius

Keep on and on at an instrument? (4)

Ross

I believe the answer is:

harp

I'm a little stuck... Click here to teach me more about this clue!

'instrument?' is the definition.
(I know that Harp is a instrument)

I don't understand the rest of the clue.

Can you help me to learn more?

(Other definitions for harp that I've seen before include "Keep on about" , "Lyre" , "Stringed instrument" , "semitone higher, abandoning intro" , "Emblem of Ireland" .)

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